I've checked the data from Muse Direct, and you are right, blink and jaw_clench are missing.
As well as blink and jaw_clench, after converting the Muse Direct recording to text using Muse Player, I noticed that there are a lot of eeg lines with completely blank data like this
1508952683.743996 /muse/eeg ffffff 843.333313 857.838806 822.783875 827.216125 nan nan
1508952683.744021 /muse/eeg ffffff 850.989014 855.824158 821.172180 836.483521 nan nan
1508952683.744043 /muse/eeg ffffff 866.300354 862.271057 817.948730 839.706970 nan nan
1508952683.784281 /muse/acc fff 0.063171 0.135986 0.993286
So I wouldn't recommend using it for anything serious until this bugs are fixed. Bear in mind that Muse Direct is still labelled BETA; I'm sure these things are on their improvements list, along with adding some real algorithms for us to play with!
Lastly note that in Muse Direct they always output EEG with 6 values (as seen above). So in this case Aux Right is the sixth element /eeg(5) as /eeg(4) is reserved for Aux Left on the old headband. To get the sixth value to actually have data in it, you have to select PRESET_20 for the MU_02.